﻿// Study0202.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//数据类型，常量与变量

#include <iostream>
using namespace std;

int main()
{
    const double pi = 3.14159;
    int radius=0;
    cout << "Please enter the radius!\n";
    cin >>radius;
    cout << "Now the radius is:" << radius << '\n';
    cout << "PI is:" << pi << '\n';
    cout << "please enter a different radius!\n";
    cin >> radius;
    cout << "Now the radius is changed to:" << radius << '\n';    
    cout << "PI is still :" << pi << '\n';
    return 0;
}

